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Study on Microstructure and Surface Photovoltage Characters of CdTe Nanocrystalline

Author: YangWeiYong
Tutor: LiKuiYing
School: Yanshan University
Course: Materials Science
Keywords: Ligand Cadmium telluride Nanocrystalline Microstructure Surface photovoltage
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


This aqueous phase synthesis method used to with body 3 - mercaptopropionic acid (MPA), thioglycolic acid (TGA), L- cysteine ??(L-Cys) as stabilizer for synthesis of water-soluble CdTe nanocrystals using orthogonal design optimized experimental conditions . Ligand -modified CdTe nanocrystals micro- structure and optical properties were analyzed. X-ray diffraction (XRD) and EDS spectrum component samples were analyzed, and the grain size calculated by the software ; using Fourier transform infrared spectroscopy (FTIR) analysis of the sample into a key case ; using transmission electron microscopy (TEM) and by means of infrared microscopic structure of the samples were analyzed and characterized ; using UV absorption spectrum and fluorescence changes of the reaction time of the sample ; using surface photovoltage spectroscopy (SPS) of the sample surface of carriers transfer transition behavior . And using Material Studio software to build cadmium telluride doped with different sulfur content of the structural model to calculate the band structure , partial density of states, optical properties for the analysis of experimental results provide a theoretical basis and foundation . The results showed that: the ligand -modified CdTe nanocrystals average particle size of about 2 ~ 4nm , the zinc-blende structure ; ligand during the reaction with the participation of the form similar to CdTe / CdS / ligand core-shell structure . By changing the reaction time to control the size of the sample ; surface photovoltage spectroscopy further analysis is S and the ligand in the reaction element , mercapto acid -modified ligand cadmium telluride photovoltaic response of samples of high strength than the L-cysteine ??; field-induced surface photovoltage spectroscopy (EFISPS) detected , the sample at a wavelength of 350nm and 470/545nm induced surface photovoltage response peaks correspond to two different charge transfer transition ; experimental and computational analysis showed that the sulfur doping makes the band gap showed increased blue shift and showed a P-type surface photovoltaic properties .

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